What is the appearance of the typical "J wave" or "Osborn wave" on an ECG?

The typical "J wave" or "Osborn wave" is characterized by a distinctive upward deflection at the junction between the QRS complex and the ST segment on an ECG. This upward wave is often seen in cases of hypothermia, and it can appear as a small notch or a more pronounced wave, depending on its amplitude. It specifically occurs at that critical transition point, distinguishing it from other waveforms seen in different types of arrhythmias or conditions.

Recognizing this feature is important in clinical practice, as it can indicate underlying conditions that may require immediate attention, such as severe hypothermia. Understanding the J wave's typical morphology helps health care practitioners diagnose and manage patients effectively. Other descriptions, such as a flat baseline between the QRS and ST segment or a downward deflection after the ST segment, do not accurately represent the specific appearance or significance of the J wave. Additionally, a prolonged QRS duration relates to different pathophysiological processes, making it unrelated to the typical J wave appearance.